81374635 has 8 divisors (see below), whose sum is σ = 98598240. Its totient is φ = 64467264.

The previous prime is 81374617. The next prime is 81374639. The reversal of 81374635 is 53647318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81374635 - 2¹³ = 81366443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81374594 and 81374603.

It is not an unprimeable number, because it can be changed into a prime (81374639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78490 + ... + 79519.

It is an arithmetic number, because the mean of its divisors is an integer number (12324780).

Almost surely, 2^81374635 is an apocalyptic number.

81374635 is a deficient number, since it is larger than the sum of its proper divisors (17223605).

81374635 is a wasteful number, since it uses less digits than its factorization.

81374635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158117.

The product of its digits is 60480, while the sum is 37.

The square root of 81374635 is about 9020.7890453108. The cubic root of 81374635 is about 433.3409035495.

The spelling of 81374635 in words is "eighty-one million, three hundred seventy-four thousand, six hundred thirty-five".